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  • APL23-AR-02212

    Rights statement: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 122, 222601 (2023) and may be found at https://pubs.aip.org/aip/apl/article/122/22/222601/2893310/

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Sensitivity of a DC SQUID with a non-sinusoidal current-phase relation in its junctions

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
Article number222601
<mark>Journal publication date</mark>29/05/2023
<mark>Journal</mark>Applied Physics Letters
Issue number22
Volume122
Number of pages5
Publication StatusPublished
<mark>Original language</mark>English

Abstract

In ballistic superconductor–normal metal–superconductor Josephson junctions, such as those made from graphene or high mobility semiconductors, the current-phase relation may not have the common, sinusoidal form but can be skewed to have a peak supercurrent at a phase difference greater than π/2⁠. Here, we use a numerical simulation that includes thermal noise to investigate the sensitivity of a DC superconducting quantum interference device (SQUID) with such junctions. The simulation uses a resistively and capacitively shunted junction model where the current-phase relation of each junction can be defined as an arbitrary function. The modulation, transfer function, noise, and sensitivity of a SQUID are calculated for different types of current-phase relation. For the examples considered here, we find that the flux sensitivity of the SQUID is always degraded by forward skewing of the current-phase relation, even in cases where the transfer function of the SQUID has been improved.